Howdy, I'm starting to get into some surfing and now that things are getting colder I thought I'd start a winter project.

A friend of mine has a rocker line from he made that I am going to use, but I don't know what shape I should go for. I've tried to Google it but without much success.

I am almost 70kg and surf mostly in wind generated onshore mush. Most common kite is going to be my 8m, which for me is around 18-25kts. Are there some guidelines that I could follow regarding the outline? Does anyone know of any resources out there?

I do have a beat up (non-kite) surfboard around 5'9" x 18" x 2" which seems pretty lightweight, but thought that might be a bit small. Thoughts?